2022英语周报九年级外研版第十期答案

第三节书面表达wersionDear Sir or MadamMy name is Li Hua. As an exchange student fromChina, I am studying in a local school. I am reallydelighted to learn that a volunteer for your Chinese culturallic exhibition is required and I'm confident that I amtruly fit for thestart with, my advantage first lies in the fact that IChina and used to beand quite familiar with Chinese relics. Further-more, being an outgoing and optimistic boy, I am good atcommunicating with others and introducing Chinese cultureto the world is always my honor and my pleasure. Finallythere is no problem with my spoken English, as I havelived here for almost a year and I have no difficulty commu-dicating with others in EnglishI would really appreciate it if you can offer me thechance to be a volunteer in your museum. I am looking forward to your early reply.Li Hua

16.【解析】(1)线框匀速运动时,产生的电动势E=Bl1v分)由欧姆定律得I=R(1分)ab边所受的安培力F=BI(1分)由平衡条件得mg=F(1分)R联立解得v=B(1分)(2)导线框穿过磁场的过程中,通过导线框横截面的电荷量q=Tt(1分)ER(1分)E=A中_B1l2△t联立解得q=Bl,l2R(1分)(3)导线框穿过磁场的过程中,利用能量守恒定律得mg(h+l2=om2+Q(1分)解得Q=mg(h+l2)-B(1分)

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